One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,14)(4,20)(5,9)(6,29)(7,13)(8,17)(10,22)(11,27)(12,31)(15,44)(16,47)(18,34)(19,35)(21,53)(23,57)(24,40)(25,41)(26,36)(28,42)(30,43)(32,51)(33,48)(37,45)(38,50)(39,58)(46,61)(49,63)(52,59)(54,62)(55,64)(56,60) involution — undirected(1,3,5,26,7,17,27,18)(2,8,11,36,13,14,9,34)(4,21,22,48,25,16,24,50)(6,30,28,19,31,15,45,51)(10,38,20,47,40,33,41,53)(12,43,42,32,29,44,37,35)(23,46,56,49,59,54,58,55)(39,63,52,61,60,64,57,62)(2,9)(3,15,17,30)(5,27)(6,28)(8,32,14,35)(10,20)(11,13)(12,29)(16,46,21,54)(18,51,26,19)(22,24)(23,58)(31,45)(33,61,38,62)(34,44,36,43)(39,60)(40,41)(47,64,53,63)(48,49,50,55)(56,59)(1,4,7,25)(2,10,13,40)(3,16,17,21)(5,24,27,22)(6,23,31,59)(8,33,14,38)(9,20,11,41)(12,39,29,60)(15,46,30,54)(18,50,26,48)(19,49,51,55)(28,58,45,56)(32,61,35,62)(34,53,36,47)(37,52,42,57)(43,64,44,63)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.